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arXiv 2201.05126cond-mat.stat-mechmath-phmath.MP
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确定性相互作用模型中的精确反常电流涨落

Exact anomalous current fluctuations in a deterministic interacting model

Žiga Krajnik, Johannes Schmidt, Vincent Pasquier, Enej Ilievski, Tomaž Prosen

AI总结:

本研究解析计算了确定性相互作用粒子模型的电荷涨落全计数统计,发现无偏稳态下典型涨落呈非高斯且高阶累积量奇异增长,揭示新型动力学普适类。

摘要:

我们解析计算了一个相互作用带电粒子经典自动机中电荷转移的全计数统计。针对平稳平衡态,我们推导了矩生成函数的闭式表达式,并采用渐近分析来推断连续时间尺度范围内电荷电流涨落的结构。该解展现出若干非正统特征。最显著的是,在典型涨落的时间尺度上,无偏平稳系综中积分电荷电流的概率分布明显非高斯,尽管动力学电荷磁化率表现为扩散行为。虽然引入电荷不平衡足以恢复高斯涨落,但我们发现更高阶累积量随时间以不同指数无限增长,这意味着标度累积量具有奇异性。我们将此现象归因于矩生成函数缺乏正则性条件以及动力学临界点的出现。实际上,标度累积量生成函数无论电荷偏置如何,都不能忠实表示标度累积量的生成函数,但相应的勒让德对偶却能给出正确的大偏差率函数。我们的发现暗示了确定性多体系统中新型动力学普适类的存在。

英文摘要:

We analytically compute the full counting statistics of charge transfer in a classical automaton of interacting charged particles. Deriving a closed-form expression for the moment generating function with respect to a stationary equilibrium state, we employ asymptotic analysis to infer the structure of charge current fluctuations for a continuous range of timescales. The solution exhibits several unorthodox features. Most prominently, on the timescale of typical fluctuations the probability distribution of the integrated charge current in a stationary ensemble without bias is distinctly non-Gaussian despite diffusive behavior of dynamical charge susceptibility. While inducing a charge imbalance is enough to recover Gaussian fluctuations, we find that higher cumulants grow indefinitely in time with different exponents, implying singular scaled cumulants. We associate this phenomenon with the lack of a regularity condition on moment generating functions and the onset of a dynamical critical point. In effect, the scaled cumulant generating function does not, irrespectively of charge bias, represent a faithful generating function of the scaled cumulants, yet the associated Legendre dual yields the correct large-deviation rate function. Our findings hint at novel types of dynamical universality classes in deterministic many-body systems.

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